1. Department of Internal Medicine, Yonsei University College of Medicine, Seoul, Korea.
2. Division of Medical Oncology, Yonsei Cancer Center, Yonsei University College of Medicine, Seoul, Korea.
3. Department of General Surgery, Yonsei University College of Medicine, Seoul, Korea.
4. Department of Radiation Oncology, Yonsei University College of Medicine, Seoul, Korea.
5. Department of Medical Oncology, Gangnam Severance Cancer Center, Yonsei University College of Medicine, Seoul, Korea.
6. JE UK Institute for Cancer Research, Gumi, Korea.